# 📐  L2 Spec — Galaxy SED Fitting — Nominal + Mismatch Specs

**ID:** `L2-377-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-377`](/artifact/l1/L1-377)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.3 · **Delta tier:** 5
> **⛓ On-chain block:** 41555181

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| A v mag | — | 0.0 – 3.0 |
| N filters | — | 3 – 30 |
| Redshift z | — | 0.0 – 6.0 |
| Snr per band | — | 3 – 100 |

## 2. Tolerance (ε)

**Type:** `fn`

```
0.15 + 0.10 * (10 / SNR_per_band) ** 0.5
```

## 3. Difficulty

| Property | Value |
|---|---|
| Difficulty score | 0.3 |
| Delta tier | 5 |

## 4. Fingerprint

`6292b78329b1835224ffde43fe60291431f4dab1d93c0d473bb7c6239b0512d3`

## 5. On-chain Registration

- **Chain hash:** `0x2407225be308bbeaafec7545d9c18cb3ac69e82502901135d100e93cd4a87899`
- **Chain tx hash:** `0xdaefdad0b09789c045eda1bc6adb1da22e078c6cdea27e66e735adbcfc4ec8bc`
- **Chain block:** `41555181`

---

## File Mapping

This bundle consists of: `L2-377-001.md`, `L2-377-001.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-377-001.md` | Source of truth — edit this | Human or LLM |
| `L2-377-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |

**Prompt for your LLM after editing this Markdown:**

> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.

_This Markdown was auto-synthesized from the catalog row for `L2-377-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._